Derrick



y 1939 M. w. sARsHELb'Er AL 2,157,500

DERRICK Filed Jan. 24, 1935 3 Sheets-Sheet 1 & Clyde L. Conk/IA y 1939-M. w. SARSFIELD ET AL 2,157,500

DERRICK Filed Jan. 24, 1935 3 Sheets-Sheet 2 g wuc wtoc Myron W.fdnrfei/o C/yoz L. Con/din May 1939' w SARSFIELD ET AL 2,157,500

DERRICK 3 Sheets-Sheet 3 Myron Wfiar/fai/d Filed Jan. 24, 1935 4 C/yoeL. Con/din Patented May 9, 1 939 UNITED STATES PATENT OFFIQE DERRICKApplication January 24, 1935, Serial No. 3,299

3 Claims.

This invention relates to new and useful improvements in derricks.

One object of the invention is to provide an improved two-legged derrickof the gin-pole or stub derrick type, which may be used either in theusual manner, as well as for drilling or pulling casing, or for anyother purpose.

An important object of the invention is to provide a single mast derrickconstructed of tubular members welded together in such a manner as tonot only eliminate bolts and clamps, but to reinforce and strengthen thestructure to such an extent that it may be used for heavy duty work, notpossible with the present type of single mast derricks.

Another object of the invention is to provide an improved derrickstructure which is constructed of a plurality of sections connectedtogether, whereby when dis-assembled, the sections may be readilytransported; said structure being provided with trusses overlying thesections for bracing and trussing the entire structure, and give theeffect of a unitary structure.

A further object of the invention is to provide an improved two-leggedderrick structure which is constructed so as to carry increased loads,whereby an increased number of sheaves may be mounted at the upper endof said structure, thereby making the derrick adaptable for heavy dutywork.

Still another object of the invention is to provide an improvedtwo-legged derrick of the ginpole type so constructed as to possess thestability and strength of the ordinary two and four legged derricks, andyet being capable of inexpensive manufacture.

A construction designed to carry out the invention will be hereinafterdescribed, together with other features of the invention.

The invention will be more readily understood from a reading of thefollowing specification and by reference to the accompanying drawings,in which an example of the invention is shown, and wherein:

Figure 1 is a front elevation of a derrick constructed in accordancewith the invention.

Figure 2 is a side elevation of the same,

Figure 3 is a transverse, vertical, sectional view, taken on the line3-3 of Figure 2,

Figure 4 is an enlarged side elevation of the upper end of the derrick,

Figure 5 is an enlarged, vertical sectional view, taken on the line 5-5of Figure 1,

Figure 6 is an enlarged horizontal, cross-sectional view, taken on theline 66 of Figure 1,

Figure 7 is an enlarged, perspective view of one of the legs and showingits connection with its bracing truss,

Figure 8 is an enlarged detail, partly in elevation and partly insection of one of the coupling collars secured to the leg of thederrick,

Figure 9 is an isometric view of said coupling collar,

Figure 10 is an enlarged sectional view of an other form of said collar,

Figure 11 is an enlarged front view, partly in elevation and partly insection, of the upper end of the derrick having a plurality of drillingsheaves mounted thereon,

Figure 12 is an enlarged isometric view of one of the reinforcing platesfor the added sheaves shown in Figure 11,

Figure 13 is a side elevation of another form of base for the derrick,and

Figure 14 is a perspective view of the same.

In the drawings, the numeral iii designates an elongated, tubular lengthof well casing, or other pipe. The derrick is constructed of twosections A and B, superimposed one above the other, and each section iscomposed of a pair of the tubular lengths ll), which are inclined towardeach other at their upper ends. The lengths are connected to each otherby transverse, tubular, brace members 29 which have their ends Weldedthereto. The braces are positioned at spaced points along said pipelengths. When the sections A and B are superimposed one above the other,they form the derrick structure, the inclined tubular lengths in formingthe legs ll of said derrick.

The sections A and B are rigidly secured together by split clamping orcoupling collars l2, provided with the usual tightening bolts 53. Thecollars l2 are preferably connected by a transverse strut !2' which hasits ends welded to said collars. If desired, one end of each length ii)may be screw threaded, and screwed into a coupling sleeve it (Figure10). A weld i5 around the ends of said collar holds said lengthstherein.

The lower end of each leg ll extends through an opening l6 formed in ahorizontally extending pipe 11, which is embedded in concrete H3, orotherwise rigidly supported at ground level. The bottom of each legrests on the inner periphery of the pipe I1 and a weld H) whichsurrounds each opening i and leg, securely fastens said legs to thepipe. It is pointed out the diameter of the pipe I1 is preferably largerthan the diameter of the tubular legs ll, because said pipe carries theentire weight of the derrick.

However, the particular size of these parts are subject to variation.

At the upper end of the derrick, a transverse solid shaft 22 passesthrough openings 23 in the legs and is welded at 24 to the inner andouter side of each leg. This cross shaft forms a positive brace toprevent both inner and outer movement of the legs with relation to eachother. If desired, a pulley (not shown) may be mounted on this shaft.

To further brace each leg II and also to securely hold the ends of eachsection A and B within the clamping collar l2, trusses 25 are providedon the front and rear sides of each leg. Each truss comprises struts 26which are connected to each other at one end by a turnbuckle 2"|. Thestruts are disposed contiguous to, and overlie each leg H and the upperstrut has its other end welded to the upper end of the section A, whilethe lower strut has its other end secured to the lower end of thesection B. The turnbuckle 21, connecting the struts, is locatedsubstantially opposite the clamping collar I2 and this end of each strutis held outwardly from the leg H by outwardly extending guides 28 whichare secured to the leg The guides comprise a short length of tubingwhich has its outer end cut out at 29 to receive the strut. It isobvious, by observing Figure 2, that by tightening the turnbuckle, thestruts are drawn together to pull the two sections A and B togetherwithin the collar 2. Since the trusses extend substantially the Verticallength of the derrick, they also serve to strengthen and brace theentire structure.

For supporting sheaves 30 at the top of the derrick structure, the upperends of the legs II are cut-out at 3| to form saddles. Sleeves 32 areseated in the saddles and are welded thereto at 33. A transverse sheaveshaft 34 has its ends extending through the sleeves, and pins 35 and 35'pass through the sleeves and the shaft to hold the latter in position.The sheaves 30 are journaled on the shaft between the inner ends of thesleeves. It is pointed out that since the sleeves are secured to thelegs H .and the shaft 34 fastened in the sleeves, said shaft aids inbracing the upper end of the derrick structure.

For lubricating the sheaves, the shaft is provided with an elongatedaxial opening 36 which extends from one end of the shaft to a pointopposite the sheaves 33. Radial ports 31 extend from the inner ends ofthe opening to the periphery of the shaft, and a lubricating cup 38 ofthe usual construction, is connected with the outer end of said opening,whereby lubricant is supplied to the rotatable sheaves. Since thelubricating opening is located axially of the shaft, the pin 35 whichpasses through one of the sleeves 32 (Figure is disposed slightly offcen-- ter so as not to block said opening.

It is obvious from the above that a most rigid and inexpensive derrickis provided. The tub-ular sections, of which the entire structure isformed, may be sections of well casing and tubing which are alwaysavailable around an oil field. All of the parts are of comparativelyshort lengths and may be easily handled. The construction of the derrickin sections increases ease of assembling and dissernbling. The weldingof the various members of each section eliminates the usual bolts and.makes for an integral structure which increases strength and rigidity.It is pointed out that although only two sections are shown any desirednumber may be employed in building the derrick.

In Figures 1 and 12, I have shown a plurality of drilling sheavesmounted at the upper end of the derrick structure. Instead of thesheaves 30, a single sheave 40 is mounted centrally of the shaft 34. Asecond sheave shaft 4| is mounted below the shaft 34, having its endsfastened in sleeves 42 extending through and welded in openings 43 inthe legs. A drill sheave 44 is mounted centrally of the shaft 4| and apair of casing sheaves 45 are mounted on each side of the drill sheave.The lower shaft 4| is braced by vertically extending fiat brace straps46 which have openings 41 at their upper and lower ends. The shafts 34and 4| extend through these openings, whereby said shafts are connected.This form may be used for heavy duty Work, such as drilling, pullingcasing, etc.

In Figures 13 and 14, I have shown another form of base for the verticallegs ll of the derrick. In this form the horizontal pipe I? iseliminated and a base plate 50 provided for each leg I I. The plate isembedded in concrete or secure-d to a wooden sill, and a complementaryplate 5| is hinged to said plate. The legs H are secured to the plate 5|and it is obvious that each leg is capable of swinging movement, wherebyit may be swung to a horizontal position, which makes for easierassembly Also, by removing the hinge pin 52, the plates may beseparated, so that the entire derrick may be readily moved from place toplace after assembly.

What we claim and desire to secure by Letters Patent is:

1. A unitary derrick structure comprising a plurality of tubularsections, said tubular sections each comprising a pair of legspermanently con nected by cross bracing members and the legs of onesection adapted to be positioned in endwise relation with respect to thelegs of an adjacent section, coupling means between the ends ofsections, and truss means for the sections comprising a pair oflongitudinal truss rods extending along opposite sides of each leg inplanes normal to the plane defined by the connected leg members of thesections, means adjacent the connected ends of the sections spacing saidrods from the legs, and tie means between the corresponding meeting endsof the truss rods for drawing the sections together 2. A unitary derrickstructure comprising a plurality of tubular sections, said tubularsections each comprising a pair of legs permanently connected by crossbracing members and the legs of one section adapted to be positioned inendwise relation with respect to the legs of an adjacent section,coupling means between the ends of sections comprising a cross bracehaving socket clamping means at its ends into which the adjacent ends ofthe sections are secured, and truss means for the sections comprising apair of longitudinal truss rods extending along opposite sides of eachleg in planes normal to the plane defined by the connected leg membersof the sections, means adjacent the connected ends of the sectionsspacing said rods from the legs, and tie means between the correspondingmeeting ends of the truss rods for drawing the sections together.

3. A unitary derrick structure comprising a plurality of tubularsections, said tubular sections each comprising a pair of legspermanently connected by cross bracing members and the legs of onesection adapted to be positioned in endwise relation with respect to thelegs of an adjacent section, a transverse tie member extending betweenand entirely through the legs of the uppermost section and welded toeach leg on opposite sides thereof whereby the upper end is rigidlybraced, coupling means between the ends of sections, and truss means forthe sections comprising a pair of longitudinal truss rods extendingalong opposite sides of each leg in planes normal to the plane definedby the connected leg members of the sections, means adjacent theconnected ends of the sections spacing said rods from the legs, and tiemeans between the corresponding meeting ends of the truss rods fordrawing the sections together.

IMYRON W. SARSFIELD. CLYDE L. CONKLIN.

